Questions tagged [blockchain]

This tag should be used for questions pertaining to the blockchain. The blockchain is a list of all transactions that have occurred using the Bitcoin currency. It consists of blocks which are linked to each other, and each block consists of transactions. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

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Where does “Included in Block” value comes from?

I was exploring transactions inside of a blockchain using this site, and inside of a transaction I noticed there is attribute called Included in Block and its description is: block this transaction ...
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Blockchain transaction change output

I'm very new to this. It’s hard to know for sure, but what’s most likely the case with the below transaction: Someone sent 25.99 bitcoin to another person/organization Someone sent 1 bitcoin to ...
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Blockchain transaction unspent [duplicate]

This is a bitcoin transaction as shown in a blockchain explorer. What does ‘2 confirmations’ mean here? Sorry for the picture quality. Which one is the best answer? 2 confirmations by miners are ...
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how to find the block height from merkle root?

I have the merkle root, using this value, how to get the block hash or its height? There is this merkle root available in getblock RPC output: ./bitcoin-cli getblock ...
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Can one consider that the interest of other actors/stakeholders would change something about the concept of “blockchain”?

I am new to the Bitcoin world and am trying to get an overview within a research project. I see that Bitcoin was born out of a certain motivation to decentralize money and that decentralization, open ...
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4answers
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Does blockchain without currency make any sense?

I keep reading about private companies building blockchains for stuff like supply chain management, and about the billions of dollars that are going to be invested in blockchain over the next 5 years, ...
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How Do I Fix This Error Without Loosing Stored Blocks On Pc?

I opened my Bitcoin Core program today on my Windows 7 PC via an external hard disk (1 TB) and I found the following error: MinGW Runtime Assertion Assertion Failed! Program: E:\Blockchain\bitcoin-qt....
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Bitcoincore wallet 0.20.0

Because on windows it is so difficult to load the blockchain into the BitcoinCore wallet. Arrives in 2016 the loading rate increases days. In ubuntu18.04 it is so fast and does not slow down after ...
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3answers
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Basic question about transaction verification

I am fairly new to crypto and had some questions about how transactions are verified by the nodes Would it be correct to say that the full nodes check to see if the sender(Alice’s) signature is valid. ...
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Parsing transaction hash from rawblock data

I got block raw data next url https://blockchain.info/rawblock/00000000000000000002447735c7723ee9188322c0938e6587866a4458b9135f?format=hex Can I find transaction hash in url used python?
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Who was the originator of the term “Internet of Value?”

I am most familiar with the term "Internet of Value" as it is used by the company Ripple. The term is used as a parallel to the "Internet of Information." The idea being that money ...
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Can I get all block header data like the SPV node?

It hasn't been long since I studied Blockchain. I only need header data, not all block data, for study purposes. As far as I know, the SPV node stores only the block's header information. Can i get ...
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Would this alternative to Proof of Work work? [closed]

I'm fairly new to the subject, but I've read enough to figure out that Proof of Work has a problem concerning mining pools, and other alternatives don't seem to convince me either. I thought of my own,...
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1answer
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How can I download a single Bitcoin block?

I just started studying bitcoin. I would like to be able to download a single block from the Bitcoin network. I referred to the following: https://blockchain.info/rawblock/...
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How to recover bitcoin wallet from messed up seeds [duplicate]

I have a ledger nano s wallet that is broken , when i tried to recover wallet from 24 recovery word i got error that says the recovery phrase is incorrect, i think the place of some words is incorrect ...
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1answer
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Can we determine which one of the referenced outputs corresponds to a cashback transaction in BTC transaction scripts?

let me quickly elaborate the question. The structure of a BTC transaction script looks somewhat like the following example "...
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generating a private key for a blockchain wallet [duplicate]

I hired a broker to make forex and crypto profits for me. They did and put it in my broker account. the only method to get the profit out was to put it in a blockchain wallet. After they did this, ...
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3answers
59 views

Does descendant size affect transaction fees?

While calculating the transaction fee miners usually take ancestor size into the account. But does the descendant/output also affect the transaction fee calculation? Is descendant count correlated to ...
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2answers
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Is that proved that for each block there is always nonce value which will make block hash to start by n count of 0

Sorry for the obvious question, but I'm looking for a mathematical prove. Block header is calculated as a concatenation of the following values. Version hashPrevBlock hashMerkleRoot timeStamp Bits ...
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1answer
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Im new! I just need to add bitcoin to my wallet for a one-time transaction! Pls help! [duplicate]

Ok, Im new. Totally. ALL I WANT TO DO IS USE MY MONEY TO PUT BITCOINS IN MY WALLET IN ORDER TO MAKE A SINGLE TRANSACTION. THAT IS IT! I have a Galaxy S10e & this was one of the choices of wallets ...
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2answers
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Is a hypothetical Bitcoin network on Mars guaranteed to fork from the one on Earth?

Electromagnetic waves take between ~4 and ~24 minutes (mean: ~14 minutes) to travel a one-way trip between Earth and Mars. Suppose I set up a Bitcoin network on Mars. Is it guaranteed to eventually ...
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1answer
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I transferred about 0.54 BTC and I cannot find this on Blockchain.com. Can anyone help? [closed]

I'm hoping someone more onto it can help me find or understand exactly what happened when I xferred my BTC from an exchange (Dasset) to my wallet. I transferred about 0.54 BTC to ...
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16 views

How to find the threshold of hash inequality at a given time?

For a miner to mine in bitcoin, he should find a nonce s.t the hash of block <= threshold. At a given time lets assume the total hash rate of the network be A hashes/sec and the mining rate be f ...
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What is the probability of mining a block by a miner controlling a fraction of hashing power?

Suppose a miner controls α fraction of the hashing power and the chain on which he is trying to mine has the mining rate given by f. How to find the probability of mining a block by the miner?
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Online BTC wallet implemention with bitcoin-core

I have written a php code to register users and create wallet for them on bitcoin-core full node.My question is how can i manage users wallets.if i use loadwallet to load USER A wallet and get address ...
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1answer
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Rewriting the blockchain?

The main bitcoin blockchain (the chain that miners choose to work on) is the chain with the most proof of work ("heaviest" chain). Currently, the cumulative proof of work on the bitcoin main ...
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1answer
49 views

bitcoin block time after halving? [duplicate]

I would like to know why the bitcoin block time is taking longer than 10 minutes, I know that bitcoin halving had decrease reward and increase difficulty but according what I read the blockchain ...
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1answer
46 views

Unable to make custom Bitcoin command

I'm writing a thesis on Bitcoin system and as a part of my assignment i have to explore Bitcoin-core source code. I 've downloaded the code, compiled it and manage to run it. However, I wanted to ...
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1answer
50 views

Replace-by-fee issue

Ok so i recieved a 50$ transaction and it was on my account ( the bottom transaction) and 2 days later i have 0 $ on account and all funds from that transaction apparently got replaced by fee, am i ...
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2answers
42 views

Can an unsynchronized node create a valid transaction?

I'm trying to understand how bitcoin transactions work. From what I understand, in the Bitcoin network nodes hold different versions of the Blockchain and after some time the different chains start ...
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Corrupt block database

I activated the core with bitcoin-qt as I always do. What can be the cause of the database loss? Synchronization is restarted from the genesis block. I use the testnet with Pruned mode activated.
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Problems Setting a Transaction Fee on a Per Transaction Basis Bitcoind

I've spent hours and hours trying to find a solution to this problem, with no success. Using Bitcoin Core on a Linux machine, so using bitcoin-cli to process commands back to the daemon. Here's what ...
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1answer
31 views

How does a miner identify himself

There has been a new mining pool appearing after the halving called Lubian.com cf https://www.cryptoglobe.com/latest/2020/05/new-bitcoin-mining-pool-comes-out-of-nowhere-already-5th-largest/ How does ...
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1answer
36 views

Is there any method to extract transactions for an bitcoin address which is not in my wallet using bitcoin core?

I have setup Bitcoin core and trying build an API to fetch all transactions under an address ( not in my wallet ). Bitcoin core RPC documention says that an address which is not in my wallet needs to ...
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1answer
26 views

How can there exist businesses that “specialize in blockchain analysis looking for patterns of usage that reveal how money is being used”?

I read this today in a SE comment for an unrelated question: there are businesses that specialize in blockchain analysis looking for patterns of usage that reveal how money is being used. To me, ...
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1answer
26 views

How Bitcoin avoids double spending?

If someone is sending bitcoin with low transaction fees and then sends the same bitcoin with higher transaction fees before the previous one is confirmed, so it is obvious that miners will pick the ...
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2answers
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Problem with data redundancy in block chain

Since the copy of same data is storedon each node in network. Does it use storage space to store same data on each node? If yes then how the data is decentralised. It is just a large network of ...
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2answers
271 views

Why raw Bitcoin transaction are in hex format?

Why are Bitcoin raw transactions in hexadecimal format? I am looking for scientific articles / books on this topic and I can't find anything, so my question is: why are they in hexadecimal and can ...
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25 views

How to calculate z and z1 from ecdsa signature [duplicate]

Can anyone explain me any clearly answer or code in python with examples how we can calculate z and z' value fromECDSA Signature order? I search in google and youtube and i not saw any correctly ...
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0answers
47 views

How can i calculate z and z1 from ecdsa signature

Can anyone explain me any clearly answer or code in python with examples how we can calculate z and z' value fromECDSA Signature order? I search in google and youtube and i not saw any correctly ...
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0answers
20 views

What is being done to avoid 51% consensus attack given 80%+ of miners are Chinese and that government could centralize all mining operations? [duplicate]

What is being done to avoid 51% consensus attack given 80%+ of miners are Chinese and that government could centralize all mining operations? / Can the consensus % be incremented to a higher more ...
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1answer
41 views

How does the network verify previous transactions when transferring BTC between two users?

When transferring BTC between two users, the new transaction will consist of references to previous transactions. For example, if I user A wishes to transfer 1 BTC to user B, he will need 'n' ...
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1answer
33 views

Is it possible to use Bitcoins from an old or changed adress confirmed on the blockchain?

I sent & Confirmed bitcoins from my Luno Wallet using the adress from a binary miner. Next day the Binary miner said they received the Bitcoins BUT are UNABLE to use them to facilitate payment due ...
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19 views

How can i import a btc wallet into blockchain api v2

Hello I will use the bitcoin wallet api v2 to make payment from my website. My problem is i need to import my electrum wallet into blockchain wallet api v2, in the documentation i see that can be ...
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1answer
31 views

How to be assured a wallet is on a blockchain?

How could I check that a wallet or any app I download from Google play or Apple store or a website is truely runs by a blockchain and be certain that producing company can not manipulate the private ...
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1answer
68 views

Why am I receiving an email from Blockchain about receiving a payment?

I do not own bitcoin and do not belong to Blockchain but received an email from Blockchain about receiving payment... Incoming Payment You just received 3.86655869 BTC from an external Bitcoin ...
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How does hard fork lead to a double spending attack?

I read some article mentioned that hard fork may lead to a double spending attack. I wonder how? And i have one more question: will the bitcoin wallet address change after the hard fork?
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Could something like proof of work be provided in the form of human creativity voted on by other humans?

All that's necessary for a proof system in a blockchain, as far as I know, is that mining be hard to do and easy to validate. Creating works of art is hard to do, but determining their value is ...
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66 views

How does the mathematical problem get harder for bitcoin mining over time?

How does it become harder for miners to extract bitcoin as time passes (excluding increasing computer capabilities and the competition between miners accordingly)? Is related to the amount of bitcoins ...
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1answer
34 views

How do miners earn partial bitcoins?

I know that the miner who has the hash matching with the bitcoin's root software gets to stamp the block and put it onto the blockchain (correct me if I'm wrong). Accordingly, that miner takes the ...

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